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scripts/qemu-gdb: Split CoroutineCommand into its own file
Split the implementation of CoroutineCommand into its own file. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Message-id: 1439574392-4403-3-git-send-email-peter.maydell@linaro.org
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| #!/usr/bin/python | ||
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| # GDB debugging support | ||
| # | ||
| # Copyright 2012 Red Hat, Inc. and/or its affiliates | ||
| # | ||
| # Authors: | ||
| # Avi Kivity <avi@redhat.com> | ||
| # | ||
| # This work is licensed under the terms of the GNU GPL, version 2. See | ||
| # the COPYING file in the top-level directory. | ||
| # | ||
| # Contributions after 2012-01-13 are licensed under the terms of the | ||
| # GNU GPL, version 2 or (at your option) any later version. | ||
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| import gdb | ||
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| def get_fs_base(): | ||
| '''Fetch %fs base value using arch_prctl(ARCH_GET_FS)''' | ||
| # %rsp - 120 is scratch space according to the SystemV ABI | ||
| old = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)') | ||
| gdb.execute('call arch_prctl(0x1003, $rsp - 120)', False, True) | ||
| fs_base = gdb.parse_and_eval('*(uint64_t*)($rsp - 120)') | ||
| gdb.execute('set *(uint64_t*)($rsp - 120) = %s' % old, False, True) | ||
| return fs_base | ||
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| def get_glibc_pointer_guard(): | ||
| '''Fetch glibc pointer guard value''' | ||
| fs_base = get_fs_base() | ||
| return gdb.parse_and_eval('*(uint64_t*)((uint64_t)%s + 0x30)' % fs_base) | ||
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| def glibc_ptr_demangle(val, pointer_guard): | ||
| '''Undo effect of glibc's PTR_MANGLE()''' | ||
| return gdb.parse_and_eval('(((uint64_t)%s >> 0x11) | ((uint64_t)%s << (64 - 0x11))) ^ (uint64_t)%s' % (val, val, pointer_guard)) | ||
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| def bt_jmpbuf(jmpbuf): | ||
| '''Backtrace a jmpbuf''' | ||
| JB_RBX = 0 | ||
| JB_RBP = 1 | ||
| JB_R12 = 2 | ||
| JB_R13 = 3 | ||
| JB_R14 = 4 | ||
| JB_R15 = 5 | ||
| JB_RSP = 6 | ||
| JB_PC = 7 | ||
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| old_rbx = gdb.parse_and_eval('(uint64_t)$rbx') | ||
| old_rbp = gdb.parse_and_eval('(uint64_t)$rbp') | ||
| old_rsp = gdb.parse_and_eval('(uint64_t)$rsp') | ||
| old_r12 = gdb.parse_and_eval('(uint64_t)$r12') | ||
| old_r13 = gdb.parse_and_eval('(uint64_t)$r13') | ||
| old_r14 = gdb.parse_and_eval('(uint64_t)$r14') | ||
| old_r15 = gdb.parse_and_eval('(uint64_t)$r15') | ||
| old_rip = gdb.parse_and_eval('(uint64_t)$rip') | ||
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| pointer_guard = get_glibc_pointer_guard() | ||
| gdb.execute('set $rbx = %s' % jmpbuf[JB_RBX]) | ||
| gdb.execute('set $rbp = %s' % glibc_ptr_demangle(jmpbuf[JB_RBP], pointer_guard)) | ||
| gdb.execute('set $rsp = %s' % glibc_ptr_demangle(jmpbuf[JB_RSP], pointer_guard)) | ||
| gdb.execute('set $r12 = %s' % jmpbuf[JB_R12]) | ||
| gdb.execute('set $r13 = %s' % jmpbuf[JB_R13]) | ||
| gdb.execute('set $r14 = %s' % jmpbuf[JB_R14]) | ||
| gdb.execute('set $r15 = %s' % jmpbuf[JB_R15]) | ||
| gdb.execute('set $rip = %s' % glibc_ptr_demangle(jmpbuf[JB_PC], pointer_guard)) | ||
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| gdb.execute('bt') | ||
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| gdb.execute('set $rbx = %s' % old_rbx) | ||
| gdb.execute('set $rbp = %s' % old_rbp) | ||
| gdb.execute('set $rsp = %s' % old_rsp) | ||
| gdb.execute('set $r12 = %s' % old_r12) | ||
| gdb.execute('set $r13 = %s' % old_r13) | ||
| gdb.execute('set $r14 = %s' % old_r14) | ||
| gdb.execute('set $r15 = %s' % old_r15) | ||
| gdb.execute('set $rip = %s' % old_rip) | ||
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| class CoroutineCommand(gdb.Command): | ||
| '''Display coroutine backtrace''' | ||
| def __init__(self): | ||
| gdb.Command.__init__(self, 'qemu coroutine', gdb.COMMAND_DATA, | ||
| gdb.COMPLETE_NONE) | ||
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| def invoke(self, arg, from_tty): | ||
| argv = gdb.string_to_argv(arg) | ||
| if len(argv) != 1: | ||
| gdb.write('usage: qemu coroutine <coroutine-pointer>\n') | ||
| return | ||
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| coroutine_pointer = gdb.parse_and_eval(argv[0]).cast(gdb.lookup_type('CoroutineUContext').pointer()) | ||
| bt_jmpbuf(coroutine_pointer['env']['__jmpbuf']) |